<!DOCTYPE html>
<html>
<head>
<title>Fullscreen Website Embed</title>
</head>
<body>

<h2>Enter Website URL:</h2>
<input type="text" id="websiteUrl" placeholder="Enter URL here">
<button onclick="embedWebsite()">Embed Website</button>

<div id="websiteContainer"></div>

<script>
function embedWebsite() {
  const websiteUrl = document.getElementById("websiteUrl").value;

  if (websiteUrl) {
    const websiteContainer = document.getElementById("websiteContainer");
    websiteContainer.innerHTML = `
      <iframe 
        src="${websiteUrl}" 
        width="100%" 
        height="100%" 
        frameborder="0" 
        allowfullscreen
      ></iframe>
    `;
  } else {
    alert("Please enter a website URL.");
  }
}
</script>

</body>
</html>